If the earth was invaded by aliens, how would you use reddit (and other tools) to organize resistance and fight back?

I'm assuming moderately limited aliens - bulletproof, perhaps, but killable. They're not using weapons completely beyond our ken, and they're invading in a traditional, boots on ground sort of way. Imagining something better than the new Red Dawn, because the North Koreans are even less plausible than aliens or creatures from another dimension.

How could reddit be used as a means of disseminating intelligence, or flash mobs for resistance groups, or...?